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URN to cite this document: urn:nbn:de:bvb:703-epub-6465-4
Title data
Herrmann, Kai ; Pech-May, Nelson W. ; Retsch, Markus:
Photoacoustic thermal characterization of low thermal diffusivity thin films.
In: Photoacoustics.
Vol. 22
(June 2021)
.
- No. 100246.
ISSN 2213-5979
DOI der Verlagsversion: https://doi.org/10.1016/j.pacs.2021.100246
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Project information
| Project title: |
Project's official title Project's id Open Access Publizieren No information SFB 840 - Von partikulären Nanosystemen zur Mesotechnologie B7 |
|---|---|
| Project financing: |
Deutsche Forschungsgemeinschaft |
Abstract
The photoacoustic measurement technique is a powerful yet underrepresented method to characterize the thermal transport properties of thin films. For the case of isotropic low thermal diffusivity samples, such as glasses or polymers, we demonstrate a general approach to extract the thermal conductivity with a high degree of significance. We discuss in particular the influence of thermal effusivity, thermal diffusivity, and sample layer thickness on the significance and accuracy of this measurement technique. These fundamental thermal properties guide sample and substrate selection to allow for a feasible thermal transport characterization. Furthermore, our data evaluation allows us to directly extract the thermal conductivity from this transient technique, without separate determination of the volumetric heat capacity, when appropriate boundary conditions are fulfilled. Using silica, poly(methyl methacrylate) (PMMA) thin films, and various substrates (quartz, steel, and silicon), we verify the quantitative correctness of our analytical approach.
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